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/*
* Copyright (C) 2004-2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: sortlist.c,v 1.17 2007/09/14 01:46:05 marka Exp $ */
/*! \file */
#include <config.h>
#include <isc/mem.h>
#include <isc/util.h>
#include <dns/acl.h>
#include <dns/result.h>
#include <named/globals.h>
#include <named/server.h>
#include <named/sortlist.h>
ns_sortlisttype_t
ns_sortlist_setup(dns_acl_t *acl, isc_netaddr_t *clientaddr,
const void **argp)
{
unsigned int i;
if (acl == NULL)
goto dont_sort;
for (i = 0; i < acl->length; i++) {
/*
* 'e' refers to the current 'top level statement'
* in the sortlist (see ARM).
*/
dns_aclelement_t *e = &acl->elements[i];
dns_aclelement_t *try_elt;
dns_aclelement_t *order_elt = NULL;
const dns_aclelement_t *matched_elt = NULL;
if (e->type == dns_aclelementtype_nestedacl) {
dns_acl_t *inner = e->nestedacl;
if (inner->length == 0)
try_elt = e;
else if (inner->length > 2)
goto dont_sort;
else if (inner->elements[0].negative)
goto dont_sort;
else {
try_elt = &inner->elements[0];
if (inner->length == 2)
order_elt = &inner->elements[1];
}
} else {
/*
* BIND 8 allows bare elements at the top level
* as an undocumented feature.
*/
try_elt = e;
}
if (dns_aclelement_match(clientaddr, NULL, try_elt,
&ns_g_server->aclenv,
&matched_elt)) {
if (order_elt != NULL) {
if (order_elt->type ==
dns_aclelementtype_nestedacl) {
*argp = order_elt->nestedacl;
return (NS_SORTLISTTYPE_2ELEMENT);
} else if (order_elt->type ==
dns_aclelementtype_localhost &&
ns_g_server->aclenv.localhost != NULL) {
*argp = ns_g_server->aclenv.localhost;
return (NS_SORTLISTTYPE_2ELEMENT);
} else if (order_elt->type ==
dns_aclelementtype_localnets &&
ns_g_server->aclenv.localnets != NULL) {
*argp = ns_g_server->aclenv.localnets;
return (NS_SORTLISTTYPE_2ELEMENT);
} else {
/*
* BIND 8 allows a bare IP prefix as
* the 2nd element of a 2-element
* sortlist statement.
*/
*argp = order_elt;
return (NS_SORTLISTTYPE_1ELEMENT);
}
} else {
INSIST(matched_elt != NULL);
*argp = matched_elt;
return (NS_SORTLISTTYPE_1ELEMENT);
}
}
}
/* No match; don't sort. */
dont_sort:
*argp = NULL;
return (NS_SORTLISTTYPE_NONE);
}
int
ns_sortlist_addrorder2(const isc_netaddr_t *addr, const void *arg) {
const dns_acl_t *sortacl = (const dns_acl_t *) arg;
int match;
(void)dns_acl_match(addr, NULL, sortacl,
&ns_g_server->aclenv,
&match, NULL);
if (match > 0)
return (match);
else if (match < 0)
return (INT_MAX - (-match));
else
return (INT_MAX / 2);
}
int
ns_sortlist_addrorder1(const isc_netaddr_t *addr, const void *arg) {
const dns_aclelement_t *matchelt = (const dns_aclelement_t *) arg;
if (dns_aclelement_match(addr, NULL, matchelt,
&ns_g_server->aclenv,
NULL)) {
return (0);
} else {
return (INT_MAX);
}
}
void
ns_sortlist_byaddrsetup(dns_acl_t *sortlist_acl, isc_netaddr_t *client_addr,
dns_addressorderfunc_t *orderp,
const void **argp)
{
ns_sortlisttype_t sortlisttype;
sortlisttype = ns_sortlist_setup(sortlist_acl, client_addr, argp);
switch (sortlisttype) {
case NS_SORTLISTTYPE_1ELEMENT:
*orderp = ns_sortlist_addrorder1;
break;
case NS_SORTLISTTYPE_2ELEMENT:
*orderp = ns_sortlist_addrorder2;
break;
case NS_SORTLISTTYPE_NONE:
*orderp = NULL;
break;
default:
UNEXPECTED_ERROR(__FILE__, __LINE__,
"unexpected return from ns_sortlist_setup(): "
"%d", sortlisttype);
break;
}
}
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